I have been working with blockchains since 2013 but always wanted to know more about how the mining process worked. Last year, I fell in love with Ethereum and was excited to learn the project uses a GPU friendly algorithm. I convinced my wife to allow me to spend some money to build a GPU mining rig. At the time I built the rig, I calculated it would take over a year to break even in mining Ethereum. Luckily, the Ethereum project has taken off in a big way. The rig paid for itself in a few months, and continues to deliver. I had a lot of fun building the rig and learned a lot about how Ethereum works in the process. My rig does about 160 million hashes a second and dual mines Ethereum and Decred. Here are some details on the setup.Read More

If you have travelled in China, you likely know that many websites such as Google, Facebook, and Twitter are blocked on most internet connections. Typically I have purchased a VPN service to access blocked sites. Unfortunately, many VPN services are being detected and blocked by China’s “Great Firewall.” The best solution I have found is either to purchase a premium VPN solution, such as ExpressVPN which is specifically designed to work in China, or to use an open source solution called Shadowsocks hosted on a remote server. This tutorial provides a detailed setup of how to run Shadowsocks in a docker container deployed on a Synology NAS.

As a fun toy to explore trading, I built a “flipper” cryptocurrency trading bot in python for the Bittrex exchange. It has a trading strategy of attempting to flip between two cryptocurrencies, such as Ethereum and NEO, in hopes to obtain a small position growth each time it flips. Of course, this is just a very basic “strategy” and you will certainly need to modify it to avoid getting stuck on a losing bet.

I helped add a javascript MQTT plugin to the free IoT visualization platform freeboard.io. MQTT is an ISO standard publish-subscribe protocol for fast and secure IoT communications over TCP/IP. While there are many options for messaging, MQTT is excellent for many common IoT use cases. The IBM Watson IoT Platform provides a way to scale from free to full featured with many advanced security and integration features built in to their MQTT broker. Here is a quick demo of how to get started using MQTT IoT messaging in freeboard without requiring any programming, installation, or cost.

Automating cloud deployments around the world can become very tedious because each cloud provider API has quirks. Luckily, the world is moving beyond declarative cloud deployment automation into procedural orchestration. I’ll show how to Hashicorp’s terraform for an example IoT cloud deployment in the fastest growing cloud in the world: Alibaba’s “Aliyun” cloud, based out of China.Read More

I have explored multiple cloud providers in China, including QingCloud, over the past two years. QingCloud focuses on private enterprises in China but also caters to many startups too. I wanted to find a way to automate a Virtual Private Cloud (VPC) setup and thought I would share my script to build out a bastion host in a secure VPC. Automating their infrastructure is incredibly simple given their powerful API partnered with their private network capabilities. Having worked with clouds in Amazon, Google, IBM, Microsoft, VMWare, Aliyun… I am impressed with how easy QingCloud makes establishing a VPC either from their web portal or automated script. Here is my automated deployment script.

After reading Dr. Yves Hilpisch’s article, “Algorithmic trading using 100 lines of python code,” I was inspired to give it a shot. I wanted to apply his guide on how to use a time series momentum algorithm because I have been interested in forex trading with cryptocurrencies. I set up a free forex trial account on OANDA, jumped into a jupyter notebook, and got to work. I hit an issue. OANDA changed their API from “v1” to “v20” and all new accounts default to the new API. I ended up rewriting his sample code to work with the new OANDA v20 API using a third party python library.

Apple disabled native PPTP VPN in macOS Sierra for good reason – it is highly insecure. However, sometimes for reasons completely outside of your control you need to use a PPTP VPN. Luckily, there is a free option through Flow VPN:https://www.flowvpn.com/download-mac/

I recently helped migrate a Hover DNS domain into Google Cloud Platform DNS. Hover does not provide any public API or supported export functionality. Google has no import function built into their cloud console and provides no assistance. In case anyone else is looking to do a similar migration, here are the steps I used to automate migrating all DNS records with no disruption to any services.

As the world moves towards embracing the internet of things for industrial assets, the importance of considering security cannot be understated. Industrial IoT poses unique challenges to security in combining Information Technology security with Operational Technology security. Many of these assets were designed to serve critical functions and their reliability is paramount. All of the systems that power our modern lives are undergoing a revolution where they will be controlled or interact with software. Assets will be connected to the internet for updates, pushing data, or even remote control. How can we make these industrial IoT systems secure by design?